Lithium battery electrode material high-frequency composite vibrating screen and anti-blocking regulation and control method

Abstract

The invention discloses a lithium battery electrode material high-frequency composite vibrating screen and an anti-blocking regulation and control method thereof. The anti-blocking regulation and control system comprises a vibrating screen body which is detachably mounted on a working platform through a spring seat; a three-dimensional wave-shaped screen is installed in the middle of the vibrating screen, a porous air cushion layer is arranged at the bottom of the three-dimensional wave-shaped screen, and a transducer is installed at the end of the three-dimensional wave-shaped screen. A vibrating motor is mounted below the vibrating screen body; eccentric blocks are symmetrically arranged at the output end of the vibrating motor; the anti-blocking regulation and control method comprises the following steps: performing low-frequency mechanical vibration Performing high-frequency ultrasonic vibration; and the pressure difference is monitored and regulated in real time. According to the invention, the problems of low efficiency, easy blockage and high energy consumption of ultrafine powder screening are systematically solved, meanwhile, necessity and flexibility are considered through modular design, and reliable equipment support is provided for continuous production of lithium battery materials.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production equipment, and particularly relates to a high-frequency composite vibrating screen for lithium battery electrode materials and an anti-clogging regulation method. Background Art

[0002] A lithium battery is a type of battery with a lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. It has the advantages of high energy density, low self-discharge rate, no memory effect, long cycle life, etc., and can store a large amount of electric energy in a smaller volume and weight, and is widely used in fields such as portable electronic devices, electric vehicles, and energy storage systems. With the improvement of the energy density, mass consistency, and foreign matter control requirements of lithium-ion batteries, it is necessary to strictly control the particle size of cathode material powders such as lithium iron phosphate, ternary (NCM / NCA), and nano-lithium cobalt oxide (LCO); and in the processes of material precursor synthesis, finished product coating, and post-treatment, the fine screening of 325-mesh (45μm)-400-mesh (38μm) sieves has become a key link to ensure material consistency. However, the problem of screen clogging caused by the high specific surface area, strong van der Waals force, and material viscosity of ultra-fine powders severely restricts the continuous production efficiency.

[0003] In the prior art, the effective opening area of the screen of a traditional mechanical vibrating screen is relatively low, and particles are prone to form "bridging" blockages at the edges of the screen holes. Moreover, the ability to remove the adhesion of ultra-fine powders during low-frequency mechanical screening is poor, resulting in low screening efficiency. In addition, the strong abrasiveness leads to a high wear rate of the screen wires of the screen, and thus the screen life is relatively short; although ultrasonic vibration or air flow blowing can be used to assist in reducing particle adhesion, the fluctuation of the screen tension will cause the attenuation rate of the ultrasonic amplitude, and the phase of the transducer needs to be frequently calibrated, so the practicability is poor, and continuous vibration will cause local temperature rise aging and pore size variation of the screen; while horizontal blowing can only remove the surface blockage and cannot penetrate the pores of the screen to solve the deep "jamming" problem, and there is more dust, and the high-oxygen environment is likely to exacerbate the surface oxidation of the material. Summary of the Invention

[0004] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and propose a high-frequency composite vibrating screen for lithium battery electrode materials and an anti-clogging regulation method.

[0006] To achieve the above purpose, in the first aspect, the present invention provides a high-frequency composite vibrating screen for lithium battery electrode materials, including:

[0007] The vibrating screen body is detachably mounted on the working platform through a spring seat;

[0008] A three-dimensional corrugated screen is detachably mounted in the middle of the vibrating screen. A porous air cushion layer is arranged at the bottom of the three-dimensional corrugated screen. A transducer is mounted at the end of the three-dimensional corrugated screen. The three-dimensional corrugated screen cooperates with the transducer to vibrate at a high frequency for screening materials;

[0009] A vibrating motor is detachably mounted below the vibrating screen body. Eccentric blocks are symmetrically arranged at the output end of the vibrating motor. The vibrating motor cooperates with the eccentric blocks to vibrate at a low frequency for screening materials.

[0010] In some embodiments, the surface profile of the three-dimensional corrugated screen is a periodic waveform, and the periodic waveform is any one of a sine wave, a sawtooth wave or a trapezoidal wave. The peak-to-peak distance of the periodic waveform is 5-15 mm, and the wave height of the periodic waveform is 1-3 mm.

[0011] In some embodiments, a low-friction functional coating is deposited on the surface of the screen wire of the three-dimensional corrugated screen. The thickness of the low-friction functional coating is 2-5 μm, and the friction coefficient of the low-friction functional coating is less than 0.05.

[0012] In some embodiments, pressure difference sensors are arranged on the upper and lower layers of the three-dimensional corrugated screen, and the pressure difference sensors are electrically connected to the intelligent control module.

[0013] In some embodiments, a brush strip is detachably mounted below the three-dimensional corrugated screen, and the brush strip fits the top contour of the lower cover of the vibrating screen.

[0014] In some embodiments, the pore diameter of the porous air cushion layer is 50-100 μm, and the porosity of the porous air cushion layer is 30%-40%.

[0015] In some embodiments, a vibrating screen upper cover is detachably mounted on the top of the vibrating screen body. A feed inlet is formed in the top of the vibrating screen upper cover. An exhaust port is arranged on one side of the feed inlet, and an observation port is arranged on the other side of the feed inlet. A vibrating screen lower cover is detachably mounted on the bottom of the vibrating screen body, and the vibrating screen lower cover abuts against the spring seat.

[0016] In some embodiments, a screen-under discharge port is arranged at the bottom of one side of the vibrating screen body, and a screen-over discharge port is arranged at the top of the other side of the vibrating screen body.

[0017] In some embodiments, the spring seats are symmetrically arranged on the working platform, and piezoelectric ceramics are embedded inside the support arms of the spring seats.

[0018] Second aspect, the present invention also provides a vibration sieve anti-clogging regulation method, which is executed by the high-frequency composite vibration sieve for lithium battery electrode materials as described in the first aspect. The anti-clogging regulation method includes:

[0019] S100, start the vibration motor to drive the eccentric block to perform low-frequency mechanical vibration;

[0020] S200, start the transducer to drive the three-dimensional waveform sieve to perform high-frequency ultrasonic vibration, and introduce compressed air into the three-dimensional waveform sieve to form an anti-clogging air curtain vertically upward;

[0021] S300, monitor the pressure difference between the upper and lower layers of the three-dimensional waveform sieve through a pressure difference sensor, and adjust the pressure difference in real time through an intelligent regulation module.

[0022] The present invention has the following beneficial effects:

[0023] 1. In the present invention, the three-dimensional waveform sieve cooperates with the transducer for high-frequency vibration screening of materials to make the particle group fully fluidized, and the vibration motor cooperates with the eccentric block for low-frequency vibration screening of materials to destroy the adhesion force at the particle-sieve interface. The dual-frequency vibration equalizes the acceleration distribution of the sieve, effectively avoiding local blockage;

[0024] 2. In the present invention, the three-dimensional waveform sieve is integrally formed into a waveform structure through a stamping process, effectively increasing the actual projected area of the sieve holes while effectively increasing the critical size of particle "bridging";

[0025] 3. In the present invention, a low-friction functional coating is deposited on the surface of the sieve wire of the three-dimensional waveform sieve, effectively reducing the particle adhesion force while increasing the service life of the three-dimensional waveform sieve;

[0026] 4. In the present invention, a porous air cushion layer is provided at the bottom of the three-dimensional waveform sieve. After introducing dry compressed air into the porous air cushion layer, a vertical air curtain can be generated, and the particle contact pressure can be effectively reduced through the Bernoulli effect;

[0027] 5. In the present invention, pressure difference sensors are correspondingly arranged on the upper and lower layers of the three-dimensional waveform sieve. The pressure difference sensors are electrically connected to the intelligent regulation module. By controlling the algorithm to monitor the pressure difference and increasing the air flow pressure and ultrasonic amplitude in real time, the air flow energy consumption is effectively reduced;

[0028] 6. In the present invention, a piezoelectric ceramic is embedded inside the spring seat support arm, which can generate local resonance of the sieve frame, and effectively reduce the particle adhesion amount in the contact area between the sieve frame and the sieve through vibration; A brush strip is detachably installed below the three-dimensional waveform sieve, which can periodically scrape the back of the sieve with the vibration of the sieve body to remove the particles deeply embedded in the sieve. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the high-frequency composite vibration sieve for lithium battery electrode materials proposed by the present invention;

[0030] Figure 2 This is a schematic flow chart of the anti-clogging control method for the vibrating screen proposed by the present invention.

[0031] Legend description:

[0032] 1. Vibrating screen body; 2. Spring seat; 3. Working platform; 4. Three-dimensional corrugated screen; 5. Porous air cushion layer; 6. Transducer; 7. Vibration motor; 8. Eccentric block; 9. Brush strip; 10. Upper cover of vibrating screen; 11. Feeding port; 12. Exhaust port; 13. Observation port; 14. Lower cover of vibrating screen; 15. Under-screen discharge port; 16. Over-screen discharge port. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] The embodiments of the present application provide a high-frequency composite vibrating screen for lithium battery electrode materials and an anti-clogging control method thereof, which solve the problems in the prior art that ultrasonic vibration or air flow blowing is used to assist in reducing particle adhesion, but the fluctuation of the screen tension will cause the attenuation rate of the ultrasonic amplitude, and the phase of the transducer needs to be frequently calibrated, resulting in poor practicability, and continuous vibration will cause local temperature rise and aging of the screen and pore size variation; while horizontal blowing can only remove surface blockages and cannot penetrate the pores of the screen to solve the deep "jamming" problem, and there is more dust, and the high-oxygen environment is likely to exacerbate the surface oxidation of the material. And the present application systematically solves the problems of low efficiency, easy clogging, and high energy consumption in the screening of ultrafine powders. At the same time, through modular design, the necessity and flexibility are taken into account, providing reliable equipment support for the continuous production of lithium battery materials.

[0035] Specifically, please refer to the following embodiments:

[0036] Referring to Figure 1 , an embodiment of a high-frequency composite vibrating screen for lithium battery electrode materials provided by the present invention, the specific structure includes: a vibrating screen body 1, spring seats 2 are symmetrically arranged on the working platform 3, and the vibrating screen body 1 is detachably installed on the working platform 3 through the spring seats 2.

[0037] Among them, a vibrating screen upper cover 10 is detachably installed on the top of the vibrating screen body 1, which facilitates operations such as the maintenance, cleaning, and component replacement of the internal structure of the vibrating screen. Specifically, a feed inlet 11 is provided at the top of the vibrating screen upper cover 10, enabling materials to enter the vibrating screen through the feed inlet 11 for screening operations; on one side of the feed inlet 11, an exhaust port 12 is provided, allowing the gas carried by the materials to be discharged from the exhaust port 12 after entering the vibrating screen, preventing the gas from having an adverse impact on the screening effect during the screening process; on the other side of the feed inlet 11, an observation port 13 (a detachable observation port 13 with a rubber gasket can be adopted) is provided. Through the observation port 13, the feeding condition of the materials can be directly observed, such as whether the feeding speed is uniform and whether there are blockage problems, so as to adjust the operating parameters of the feeding equipment in a timely manner and ensure the smooth progress of the screening work.

[0038] Correspondingly, a vibrating screen lower cover 14 is detachably installed at the bottom of the vibrating screen body 1, and the vibrating screen lower cover 14 abuts against the spring seat 2. Among them, a piezoelectric ceramic is embedded inside the support arm of the spring seat 2, which can generate local resonance of the screen frame; and the resonance frequency is offset from the natural frequency of the screen mesh by ±10%, ensuring that during the operation of the vibrating screen, the local resonance caused by the piezoelectric ceramic does not coincide with the vibration frequency of the screen mesh itself, thus avoiding the occurrence of resonance phenomena and further preventing damage to the vibrating screen. Specifically, the frequency of the piezoelectric ceramic sheet is 1 - 5 kHz, and the amplitude is 0.001 - 0.005 mm. The arrangement density of the piezoelectric ceramics can be designed according to actual production requirements.

[0039] It can be understood that fine particles or particles with high viscosity in the materials are prone to adhere to the contact area between the screen frame and the screen mesh. This not only reduces the effective screening area of the screen mesh, affects the screening efficiency, but also may cause blockage of the screen mesh, thereby affecting the normal operation of the equipment; while the vibration generated by the piezoelectric ceramic can effectively reduce the amount of particles adhering to the contact area between the screen frame and the screen mesh; and this piezoelectric ceramic sheet can be independently turned on and off. After being enabled, the screen mesh can maintain a good working state for a longer time, without the need to frequently clean and maintain the screen mesh, effectively reducing the frequency of manual maintenance work.

[0040] Furthermore, a screen-bottom discharge port 15 is provided at the bottom of one side of the vibrating screen body 1 for collecting and conveying the materials that fall after being screened by the screen mesh, and a screen-top discharge port 16 is correspondingly provided at the top of the other side of the vibrating screen body 1 for collecting and conveying the materials that float up after being screened by the screen mesh.

[0041] Please continue to refer to Figure 1, in this embodiment, a three-dimensional corrugated screen 4 is detachably installed in the middle of the vibrating screen. A porous air cushion layer 5 is arranged at the bottom of the three-dimensional corrugated screen 4. A transducer 6 is installed at the end of the three-dimensional corrugated screen 4. The three-dimensional corrugated screen 4 cooperates with the transducer 6 to vibrate at a high frequency for screening materials. Correspondingly, a vibration motor 7 is detachably installed below the vibrating screen body 1. Eccentric blocks 8 are symmetrically arranged at the output end of the vibration motor 7. The vibration motor 7 cooperates with the eccentric blocks 8 to vibrate at a low frequency for screening materials.

[0042] It should be noted in detail that the frequency of the low-frequency mechanical vibration is 15 - 25 Hz (when the mechanical vibration frequency is less than 15 Hz, the fluidity of the material is poor; when the mechanical vibration frequency is greater than 25 Hz, it is easy to cause secondary agglomeration of particles), and the amplitude is 2 - 5 mm. When the vibration motor 7 operates, the exciter can drive the sieve body to perform a three-dimensional elliptical motion through the eccentric blocks 8, thereby providing the main screening power and making the particle group fully fluidized. Correspondingly, the frequency of the high-frequency ultrasonic vibration is 20 - 40 kHz (when the ultrasonic vibration frequency < 20 kHz, the thermal effect is significant; when > 40 kHz, the amplitude decays too fast), and the amplitude is 0.01 - 0.1 mm. The piezoelectric ceramic transducer 6 is coupled and installed on the sieve mesh frame. When the transducer 6 operates, it will generate microscopic shear waves, thereby destroying the adhesion force at the particle-sieve mesh interface.

[0043] It can be understood that by superimposing the low-frequency mechanical vibration on the high-frequency ultrasonic vibration, the acceleration on the sieve mesh surface can be effectively increased (the acceleration of traditional equipment is less than or equal to 2000g, and in this application, it is increased to more than 5000g), and the adhering particles with a particle size less than 5 μm can be effectively peeled off. At the same time, while the mechanical vibration is used for material transportation, the ultrasonic vibration can clean the interface, thereby effectively reducing the comprehensive power consumption (the power consumption of traditional equipment is greater than 2.8 kW, and in this application, it is less than 1.2 kW).

[0044] Please continue to refer to Figure 1 , in this embodiment, the surface contour of the three-dimensional corrugated screen 4 is a periodic waveform formed by integral molding.

[0045] Specifically, the periodic waveform is any one of a sine wave, a sawtooth wave or a trapezoidal wave (the comprehensive stress distribution of the sine wave is the best). Exemplarily, when the waveform is a sine wave, the distance between wave peaks is 5 - 15 mm (when the distance between wave peaks is less than 5 mm, the material flow will be blocked; when the distance between wave peaks is greater than 15 mm, the morphology effect will be weakened), the wave height of the periodic waveform is 1 - 3 mm (when the wave height is less than 1 mm, an effective guide cannot be formed; when the wave height is greater than 3 mm, the risk of stress concentration of the sieve wire will increase), and the waveform inclination angle is 15 - 30°, which can effectively guide the particles to roll directionally along the wave valley, thereby reducing the residence time of the particles on the sieve surface.

[0046] It can be understood that the periodic waveform structure of the three-dimensional corrugated screen 4 can effectively increase the actual projected area of the sieve holes (30% increase compared to traditional flat screens), and effectively increase the critical size of particle "bridging" (the aperture ratio is increased from 1 / 3 of the traditional flat screen to 1 / 2 of the aperture).

[0047] It should be elaborated in detail that a low-friction functional coating is provided on the surface of the sieve wire of the three-dimensional corrugated screen 4. Specifically, the low-friction functional coating can be a diamond-like carbon (DLC) coating prepared by plasma-enhanced chemical vapor deposition (PECVD), or coatings such as titanium nitride and tungsten carbide that match the deposition process and the thermal expansion coefficient of the substrate. Exemplarily, when the low-friction functional coating is a DLC coating, the thickness is 2-5 μm, and the friction coefficient is less than 0.05 (the friction coefficient of the coating needs to be less than 0.1, otherwise the adhesion threshold of ultrafine powder cannot be broken through).

[0048] It can be understood that the low-friction functional coating on the screen surface can effectively reduce the adhesion force between the particles and the screen (greater than 10 nN in traditional equipment, less than 1 nN in this application) and the blockage rate of the screen (greater than 40% in traditional equipment, less than 2.1% in this application); at the same time, it can effectively reduce the wear rate of the screen (less than or equal to 0.02 μm / h), thereby increasing the service life of the screen (less than 500 h in traditional equipment, greater than 3000 h in this application).

[0049] It should be elaborated in detail that the material of the porous air cushion layer 5 is stainless steel or ceramic, or it can be entirely replaced with a microporous ceramic or a metal sintered plate (laser drilling of 316L stainless steel is the preferred option for mass production). Specifically, the aperture of the porous air cushion layer 5 is 50-100 μm, the porosity of the porous air cushion layer 5 is 30%-40%, and dry compressed air with an inlet pressure of 0.05-0.2 MPa (when the pressure is less than 0.05 MPa, the air curtain speed is insufficient; when the pressure is greater than 0.2 MPa, dust dispersion is likely to occur) is introduced. Subsequently, the air flow forms a vertically upward air curtain with a speed of 3-8 m / s (the air flow must be vertically upward; horizontal or inclined air flow will cause material loss) through the sieve holes of the porous air cushion, thereby generating the Bernoulli effect to reduce the particle contact pressure, and the penetration depth of the vertical air flow can reach more than twice the thickness of the screen, thereby effectively removing the "jammed" particles.

[0050] It should be elaborated in detail that differential pressure sensors are provided on the upper and lower layers of the three-dimensional corrugated screen 4, and the differential pressure sensors are electrically connected to the intelligent control module.

[0051] It is understandable that the differential pressure sensor can monitor the differential pressure value ΔP between the upper and lower layers of the three-dimensional corrugated screen 4 in real time. Subsequently, the intelligent regulation module (such as a PLC controller, etc.) runs intelligent regulation algorithms (such as proportional-integral-derivative control algorithm, fuzzy logic control algorithm, and gradient response control algorithm, etc., and it is necessary to be based on differential pressure rather than timing or fixed frequency control, so as to adapt to the fluctuating data of material characteristics such as moisture content change). Specifically, the measuring range of the differential pressure sensor is 0 - 500 Pa. When the differential pressure is greater than the preset value of 200 Pa, the intelligent regulation module adjusts the air flow pressure (step size 0.02 MPa) and ultrasonic amplitude (step size 0.01 mm) in real time; and when the differential pressure change rate (dP / dt) is greater than the alarm value of 5 Pa / s, the self-cleaning mode will be triggered, thereby avoiding sudden screen blockage.

[0052] It should be detailed that a brush strip 9 is detachably installed below the three-dimensional corrugated screen 4. Specifically, the material of the brush strip 9 is wear-resistant materials such as nylon and polyester (hardness is 80 - 90 Shore A), which is suitable for highly viscous powder materials, while for low-viscosity powder materials, it needs to be disabled to reduce wear.

[0053] It is understandable that the brush strip 9 fits the top contour of the vibrating screen lower cover 14 and can periodically scrape the back of the screen with the vibration of the screen body to remove the particles deeply embedded in the screen (the amplitude phase difference is 90°, the penetration depth of the bristles into the screen holes can reach 0.5 mm, and the cleaning rate is greater than 95%).

[0054] Refer to Figure 2 , the present invention also provides an embodiment of a vibrating screen anti-blocking regulation method, which is executed by the high-frequency composite vibrating screen of the lithium battery electrode material as in the above embodiment. The anti-blocking regulation method includes:

[0055] S100, start the vibrating motor 7 to drive the eccentric block 8 to perform low-frequency mechanical vibration;

[0056] S200, start the transducer 6 to drive the three-dimensional corrugated screen 4 to perform high-frequency ultrasonic vibration, and introduce compressed air into the three-dimensional corrugated screen 4 to form an anti-blocking air curtain vertically upward;

[0057] S300, monitor the differential pressure between the upper and lower layers of the three-dimensional corrugated screen 4 through the differential pressure sensor, and regulate the differential pressure in real time through the intelligent regulation module.

[0058] It should be detailed that before material screening, first ensure that all components of the vibrating screen are firmly installed and properly connected: carefully check the output end of the vibrating motor 7 to confirm that the symmetrically arranged eccentric blocks 8 are correctly installed; conduct a power-on test on the transducer 6 of the three-dimensional corrugated screen 4 to ensure that it can drive the screen to vibrate normally; at the same time, check whether the differential pressure sensors connected to each layer of the three-dimensional corrugated screen 4 are accurately connected and can communicate normally, and ensure that they can stably transmit differential pressure data to the intelligent regulation module.

[0059] Subsequently, start the vibration motor 7 to make the eccentric block 8 start low-frequency mechanical vibration. During the operation of the vibration motor 7, the exciter drives the sieve body to perform three-dimensional elliptical motion through the eccentric block 8, providing the main screening power for the entire screening process. Then, start the transducer 6 installed at the end of the three-dimensional corrugated screen 4 to make the three-dimensional corrugated screen 4 perform high-frequency ultrasonic vibration. At the same time, introduce dry compressed air into the three-dimensional corrugated screen 4;

[0060] After the low-frequency and high-frequency vibrations and the air-assisted screening start, the differential pressure sensors arranged on the upper and lower layers of the three-dimensional corrugated screen 4 are used to monitor the differential pressure values between the upper and lower layers of the three-dimensional corrugated screen 4 in real time to ensure that the pressure changes during the screening process can be accurately captured. The intelligent control module runs the intelligent control algorithm. When the monitored differential pressure is greater than the preset value, it indicates that the screen may be blocked to a certain extent. At this time, the intelligent control module will adjust the air pressure and ultrasonic amplitude in real time. By increasing the air pressure, the impact force and dispersion effect on the particles can be enhanced. When the differential pressure change rate is greater than the alarm value, the system will determine that a sudden screen blockage occurs and trigger the self-cleaning mode. During this period, the brush strip 9 can periodically scrape the back of the screen along with the vibration of the sieve body to more deeply remove the particles deeply embedded in the screen and ensure the normal operation of the screening equipment.

[0061] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-frequency composite vibrating screen for lithium battery electrode materials, characterized in that, Including: A vibrating screen body, which is detachably mounted on a working platform through a spring seat; A three-dimensional corrugated screen is detachably mounted in the middle of the vibrating screen. A porous air cushion layer is arranged at the bottom of the three-dimensional corrugated screen. A transducer is mounted at the end of the three-dimensional corrugated screen. The three-dimensional corrugated screen cooperates with the transducer to vibrate at a high frequency for screening materials; A vibration motor is detachably mounted below the vibrating screen body. Eccentric blocks are symmetrically arranged at the output end of the vibration motor. The vibration motor cooperates with the eccentric blocks to vibrate at a low frequency for screening materials.

2. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 1, wherein The surface profile of the three-dimensional corrugated screen is any one of a sine wave, a sawtooth wave or a trapezoidal wave. The peak-to-peak distance of the surface profile is 5-15 mm, and the wave height of the surface profile is 1-3 mm.

3. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 2, wherein A low-friction functional coating is deposited on the surface of the screen wire of the three-dimensional corrugated screen. The thickness of the low-friction functional coating is 2-5 μm, and the friction coefficient of the low-friction functional coating is less than 0.

05.

4. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 1, wherein Differential pressure sensors are arranged on the upper and lower layers of the three-dimensional corrugated screen, and the differential pressure sensors are electrically connected to an intelligent control module.

5. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 1, characterized in that A brush strip is detachably mounted below the three-dimensional corrugated screen, and the brush strip fits the top contour of the lower cover of the vibrating screen.

6. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 1, characterized in that The pore diameter of the porous air cushion layer is 50-100 μm, and the porosity of the porous air cushion layer is 30%-40%.

7. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 1, wherein A vibrating screen upper cover is detachably mounted on the top of the vibrating screen body. A feed inlet is opened on the top of the vibrating screen upper cover. An exhaust port is arranged on one side of the feed inlet, and an observation port is arranged on the other side of the feed inlet. A vibrating screen lower cover is detachably mounted at the bottom of the vibrating screen body, and the vibrating screen lower cover abuts against the spring seat.

8. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 7, wherein A screen-bottom discharge port is arranged at the bottom of one side of the vibrating screen body, and a screen-top discharge port is arranged at the top of the other side of the vibrating screen body.

9. The high-frequency composite vibrating screen for lithium battery electrode materials according to claim 1, wherein The spring seats are symmetrically arranged on the working platform, and piezoelectric ceramics are embedded in the support arms of the spring seats.

10. A vibration sieve anti-clogging regulation method, characterized in that, The anti-blocking control method is executed by the high-frequency composite vibrating screen for lithium battery electrode materials as described in any one of claims 1 to 9. The anti-blocking control method includes: S100, starting the vibration motor to drive the eccentric block to perform low-frequency mechanical vibration; S200, starting the transducer to drive the three-dimensional corrugated screen to perform high-frequency ultrasonic vibration, and introducing compressed air into the three-dimensional corrugated screen to form an anti-blocking air curtain vertically upward; S300, monitoring the differential pressure between the upper and lower layers of the three-dimensional corrugated screen through the differential pressure sensor, and regulating the differential pressure in real time through the intelligent control module.

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